Fuel pump for internal-combustion engines



FebQz 1926. 1,571,585

O. E. JORGENSEN FUEL PUMP FOR INTERNAL GOMBUSTION ENGINES Filed Jan. 25, 1921 f/II Y .IVI

145. 2? im. 2s f y Patented Feb. 2, 1926.

UNITED STATES PATENT OFFICE.

OLAV ESKIL JORGENSEN, F NEW YORK, N. Y., ASSIGNOR T0 WORTHING-TON PUMP AND MACHINERY CORPORATION, OF ,NEW YORK, N. Y., A CORPORATION OF VIR- GIN IA.

PUEL PUMP FOR INTERNAL-COMBUSTION ENGINES.

Application filed January 25, 1921. Serial No. 439,803. I

To all whom, t may concern: Y

Be it known that I, OLAV EsKlL Jon- GENSEN, a subject of Denmark, residing at New York city, county of New York, and State of New York, have invented certain new and useful Im rovements in Fuel Pumps for Internalombustion Engines,

fully described and 'represented in the fol-- speed of the plunger on .the pressure stroke.

of the same, the fuel being ley-passed on the fore part of the stroke `or while the plunger is attaining the requisite speed.

However, such by-passing of the fuel has been effected by more or less elaborate valve mechanism and therefore, one object of the present invention is toprovide a construction accomplishing this same result with a simplified form of pump wherein the fluid fuel is by-passed through a passage in the pumpy plunger until such lunger meets with a closure cutting off the p unger passage during the moment of highest plunger speed and thereby effecting the discharge of the fuel.

A further ufeature of the present invention consists in providing means actuated by the pump plunger for operatin the suctlon valve of the pump to relieve t e pump pressure, which means is controlled by speed responsive mechanism whereby the amount of fuel delivered to the engine on each pressure stroke of the pump is regulated according to the governed requirements of the engine.

Another object resides in combining control of the plunger by-pass with plungeroperation of the suction valve, thus providing an extremely simple construction for performing the fuel injection to the engine.

In the drawing; thegure. represents a vertical section through a pump embodying the principles of the present invention.

Referring now to the drawings: s

The invention, as shown herein for the purpose of disclosin the same, consists of a plunger chamber b ook 1 havin the suction opening 2 terminating in a rlght angle extension 3 closed at one end by a plug 4, the other end entering a bore 5 parallel with the opening 2 and in which is seated a guide thimble 6 having the enlarged portion -7 resting on a shoulder 8. A push rod 9 is guided in the guide thimble 6 and acking means 10 rests against the enlarged) end 7 of the said thimble 6 and both thimble and packing means are held by the stuiiing box nut 1l slipped onto the push rod and screwed into the plunger chamber block 1 as shown at 12.

Parallel with the bore 5 is a plunger bore 13 counterbored as at 14 yto seat the lunger packing 15 and by-pass cage 16 w ich is backed up by another packing 17 and a stufHng box nut 18.

The plunger l19 is axially passaged as at 20 in its working end and which passage terminates in a right yangle outlet 21 which permits of the discharge of fuel through the plunger and bypass cage 16 into a passage 22 leadinginto formed by two parallel passages 24 and 25 at right angles to and connecting with the plunger bore 13 and also connected with each other by the opening 26 which is directly above a suction valve 27, the stem 28 of which extends through the portion 29 of the plunger chamber block 1 and into proximity of the end of the ush rod 9. The suction valve 27 is norma y maintained closed by a coil spring 3() carried on a lug 31 on a screw cap plug 32.

Thel plunger passa-ge 20 is to be closed at its outer or inner end at a predetermined point in the plunger stroke to stop by-passing the fuel to passage 22. This closing may be secured in any other suitable manner, but preferably I close the outer end of passage 20 by a valve engaged by the plunger at the proper point in the stroke. As shown in the drawings', in the plunger bore 13 and seating on a shoulder 33 is a cup disc 34 having the valve face 35 for engagement by the end of the plunger 19, so as to close the plunger passage 30 prior to completion of the pressure. stroke of said plunger. Seating in the cup side of the disc 34 is a coil spring 36 which is maintained in position by the lug 37 of a screw plug 38.

The passage 24 `is closed at its outer end by a screw plug 39, while the passage 25 is counterbored to receive a plug 40, which retains a spring 41 seating in the shell 42 of a valve 43 which serves as a discharge valve and is located in advance of an outlet 44 to the engine.

The plunger 19 .has slipped thereover a coupling nut 45 which engages with an enlargement 46 on the lend of plunger 19 and also screws onto the threaded end 47 of a cross-head 48 guided in a bushing 49 of the member 50. The lower end of the cross-head 48 is connected by a. pin 51 with` an eccentric strap 52 on an eccentric 53 carried by a shaft 54.

The cross-head 48 carries a pin 55 working in a slot 56 of a lever 57 which is mounted at its other end on a shaft 58 which is eccentrically mounted and carries a lever 59 `connected with a centrifugal governor element diagrammatically indicated at 60.

The push rod 9 screws into the link 61 which is connected by a pin 62 with the lever 57 intermediate the pin 55 and shaft 58.

The operation is as follows: n As the shaft 54 revolves the eccentricl 53 to draw the plunger 19 downwardly.' fuel oil enters through the suction 2 and suction valve 27 and fills passages 24 and 25 and the plunger passage 20; however, as the plunger 19 moves upwardly'oil flows through the plunger passage 20, out through cage 16 and through passage 22 to the suction during the fore part of the stroke, but continued movement of the plunger 19 engages the end thereof with the valve face 35 whereupon the plunger passage 20 is cutoff and the fuel oil is ejected through the discharge valve 43 and leaves the pump by way of the outlet 44.

IVhen the required amount of fuel oil has been injected in the above manner travel of plunger 19, by reason of the pin 55 and lever 57 hascarried the push rod 9 upwardly into engagement with the end of valve stem 28 opening valve 27 and releasing any fuel oil remaining under compression in the pump.

The centrifugal governor 60 driven by the engine with which the pump is used moves the lever 59 to rotate the eccentrically mounted shaft 58 thereby varying the point at which the push rod 9 opens suction valve 27 according to the speed of the engine and thus regulates the amount of fuel oil injected by the pump.

It will be understood that the invention is not limited tothe construction shown,

but `that it may be embodied in various constructions Within the scope of the claims.

I claim:

1. In a fuel injection pump', a plunger I plunger for by-passing fluid on -the pressure stroke, means closing said plunger passage before completion of' the pressurey stroke to effect the fluid discharge, means actuated by said plunger for operating said suction means to relieve pump pressure, and speed responsive mechanism'controlling said plunger actuated means to regulate the amount of fluid pumped per plunger stroke.

3. In a fuel injection pump for combusltion engines, a plunger chamber having suction and discharge means, a passaged plunger by-passing fluid on the pressure stroke, means for engagement by the plunger for closing the plunger passage'before the end of the pressure stroke whereby fluid delivery is effected, means actuated by` said plunger for operatingA said suction meansto relieve pump pressure, and speed responsive mechanism controlling said plunger actuated means to regulate thev amount of fluid pumped per plunger stroke. ,4. In a fuel injection pump for combustion engines, a plunger chamber having suction and discharge means including valves, a plunger having a passage connecting with said suction means during a portion of its pressure stroke, a valveengaged b. said plunger to close the passage throng the latter during a portion of its pressure stroke, a lever, an eccentrically mounted pivot for one end of said lever, the other end of the same being connected with said plunger for movement thereby, a push rod carried by said lever for'lifting engagement with said suction valve, and speed responsive means for moving said eccentrically mounted pivot to vary the lift of said suction valve to relieve pump compression at approximately' the end of the pressure stroke of the plunger.

5. In a fuelA injection pump 'for comi bustion engines, a plunger chamber having suction and discharge means, a plunger in the plunger chamber, means for rendering lll Vplunger speed for effective movement of the plunger, and means actuated by the plunger 4for operating the suction means to relieve the pump pressure.

6. In a fuel inJection pump for combustion engines, a plunger chamber having suction and discharge means, a plunger in the plunger chamber, means for rendering the pressure stroke of thel plunger ineffective until the plunger has reached its moment of highest speed .comprising a passage in y the plunger connecting with lthe suction means and closure means engaging one endof said passage at the moment of highest plunger speed for effective movement of the plunger, mea-ns actuated by the plunger for operating the suction means to relieve the pump pressure, and speed responsive mechanism controlling the plunger actuated means to regulate the amount of fll'uid pumped per effective plunger stroke.

7. In a fuel .injection pump, a `plun'er chamber, a passaged plunger bypassing fluid during partof its pressure stroke, a valve controlled by-pass separate from and independent of said plunger, means actuated by the plunger for operating said valve to relieve pump pressure during the latter part of the plunger stroke, and speed responsive mechanism controlling said plunger actuated means to vary the time of o ening the by-pass valve and thus regulate t e amount of Huid delivered er plunger stroke.

In testimony w ereof, I have hereunto set my hand. I i

OLAV ESKIL JORGENSEN. 

